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  5. EC 420INT EC Intake Manifold 1.125 HL to GX390/420
EC 420INT EC Intake Manifold 1.125 HL to GX390/420
420INT EC Intake Manifold 1.125" HL to GX390/420
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EC 420INT EC Intake Manifold 1.125 HL to GX390/420

Part Number: 420INT
Your Price: $41.99
Intake Manifold EC 1.125 HL to GX390-420
Availability: In Stock.

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420INT EC Intake Manifold fits 1.125" HL Tillotson carburetors to GX390/420 Honda/Clone/Predator GX390, 420, 440, 460. 

This small carburetor limits airflow while gaining adjustability for spec 420cc kart classes. We highly recommend using our X380-7 Intimidator carburetor. Our 3-piece shaft and unique design give you the most flow from a 1.125 bore carburetor. Since EC Carburetors design the Intimidator, we offer a better-tuned fuel circuit specific to the engine to make the most power and best tunability vs. the Tillotson HL-380 were designed for open flathead engines. 

Designed and CNC machined to match each unique intake port shape precisely at the block or cylinder head entrance. (May vary on head type and model)The resulting action is no turbulence causing misalignment and much better control of the entire intake tract's laminar flow. Using the Tillotson carburetor, we can create the best angle through the port. The pulse hole is precisely located for increased pumping action at high RPM. All installation hardware included.

If you are looking at the intake length as a way of port length tuning for the engine, there are a few things you need to know. The Tillotson carburetor, a diaphragm pump carburetor, needs a good vacuum or pulse signal from the intake. If you make your intake too long, you lose signal to the carburetor and potentially hinder its tuning and performance. Tuning your port runner length is more of an exact science than many realize, and simply adding more length doesn't always net the gains you want, where you want. Your carburetor, head ports, and cam timing, as well as where you want your engine to gain, are all part of the science of port tuning. Unless you have the equipment, time, and money, it isn't easy to test the theory, and your gains may be minimal. 

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